TMRCAs tell us how old the common ancestor of Y-chromosomes in a
certain region is. They do not tell us whether this common ancestor,
or his descendants arrived _into_ the region after the TMRCA, or
whether the common ancestor arose _within_ the region.

So, knowing the age A of R-M269 or any other haplogroup tells us
nothing about whether it _arrived_ into Europe after A, or whether it
_arose_ in Europe from a line of ancestors before older than A.

On Wed, Dec 3, 2008 at 4:57 AM, Ken Nordtvedt <> wrote:
> TMRCAs don't coincide with arrival times, but some TMRCAs can place bounds
> on the when other specific males existed. And if they did not exist at
> certain times they could not be arriving anywhere at those eliminated times.
>
> Since you were holding your debate publically rather than off list, I am
> just trying to pin down which male in the R story you are saying can not be
> pinned down by a TMRCA concerning arrival time somewhere.
>
>
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